MediaWiki:UserStyles.css

/* File for adding misc CSS like special user page CSS and user highlights. */

.page-User_Flia .tabbertab { background-image:linear-gradient(to bottom, #000000b0,#000), url(https://vignette.wikia.nocookie.net/devilmaycry/images/7/77/DMC5-Nero_and_Nico_concept.jpg/revision/latest?cb=20190517155715&format=original); background-repeat:no-repeat; background-size: 100%; }